Generator of electric oscillations.



PATENTED JUNE 9, 1908.

APPLICATION FILED $313.1, 1908.

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VALDEMAF? FOUL-SEN WITNESSES.

AT TURN/E v PATENTED JUNE 9, 1908.

v. POULSEN.

GENERATOR 0P ELECTRIC OSGILLATIONS.

APPLICATION FILED FEB. 1, 1908.

2 SHEETS-SHEET Z.

INVENTOR'. VALDEMAR POUITSEN,

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WITNESSES: 4

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UNITED STATES PATENT OFFICE.

VALDEMAR POULSEN, or COPENHAGEN, DENMARK.

GENERATOR OF ELECTRIC OSCILLATIONQ.

Specification of Letters Patent.

Patented June 9, 1908.

Application mod Iebruary' 1, 1908. Serial No, 413,839.

following is a full clear, and exact description.

In the generators of electric oscillations in which is used an electric are connected with self-induction and capacity, it has, as a general rule, )roved appropriate to usecarbon as a materia for at least one of the electrodes.

(ertain considerations, however, speak in favor of using metal electrodes, these for instance conserving their shape to a higher degree than the carbon electrodes. which is of great importance for the stability of the arc. Likewise, it'is often advantageous to use electrodesof metal, as they are better heat conductors and therefore quickly lead ofl' heat from the arc.

In-the present invention, metal, for in,- stance copper, is used as material for the cathode as well as for the anode, a thin layer of a material exercising a favorable intluenee on the stability of the oscillations produced by the generator being placed on the surface of one or bot-h electrodes, thus forming the actual electrode material, and the invention aims at renewing this layer as it consumed or destroyed through the action ot' the arc. Among the substances suitable for the application of the said thin layer, carbon may,- in accordance with the above, be particularly recommended. It may be placed, for instance in the shape of a layer of soot, on the edge of a metal disll which rotates and forms one electrode, or a thin layer of Indian .ink which driesand leaves a layer of carbon, may be applied with a brush or the like. lnd1- rectly, a similar object may be attained by applying a film of oil or some. other carbon- COIltflll'llXlg substance, which will then be decarbon.

A practical form of, such a generator is shown in the drawing, where Figure 1 shows a side elevation of a gencr ator in partial section, Fig. 2 a plan view of stroyed by the arc and furnish a thin layer of the same with the cover removed and Fig. 3 a

modification. Fig. 4 is a diagrammatic view of the circuits. I

In Figs. 1 and 2, it indicates a house or a casing, in the marble-wall b of which an electrode c is movable in its longitudinal direction. The electrode 0 is made of copper and arranged on a rod provided with a button d, which rod is movable in a tube e.- A couple of pinsf in the rod pass throu h grooves in the tube a and are actuated. by a suitable spring g. A shoulder on the rod may rest against a movable sleeve h, which acts as stop and determinesthe distance of separation of the electrodes. of a rotating comer disk k which can be turned by a suitable transmission. The disk is arranged air-tight through one wall of the, casing Moreover, the casing is provided with a couple of iron cores m, m, transversely recessed or grooved to fit'over the disk electrode Is, in case'that it should be desired that, the are be acted upon by a magnetic field, and with inlet and outlet tubes n and 0, which are used in case it should be desired that the 5 arc be formed in a particular gas.

The are produced by e'tlectin contact between the-electrodes c'and k t rough a pressure on the button (1, after which the electrode c is removed, by the spring 9, as far 30 i from the disk-shaped electrode is as the stop l2 allows. t

()n the surface of the electrode which is outside the casing, the actual electrode substance may now he applied; for instance, the 5 v A thin coating, for instance of antimony,

may be obtained by means of a flame containing antnnomd of hydrogen. I have illusetrated a flame X which may be considered a sooting or antimony depositing flame. 5

Where, as in the exam le shown a rotate ing disk endless band or the like is used as bearer of the actual electrode substance, the. part of the electrode which has passed the are, can be contimtously cleaned before fresh 6 electrode substance is applied. Y designates a brush or snmlar wiper which may be con-- sidcred an example of a means .or this pur'- pose.

endless, and which is introduced between the,

electrodes 2 and 3, which band is movable and acts as an intermediate electrode. A coating of the kind mentioned may be applied on one or both sides of the said band. if such a generator be used for wireless transmission of signals (telcgraphy or teleph- The other electrode consists 65 in Fig. 3, l indicates a band, which may be ony), the principle described afl'ords the possibility of a new method of transmitting the signals. For instance, on the rotating electrode r, Figs. 1 and 2 mentioned, carbon may be applied according to the signaling, as Morse signs or the like,so as to obtain the variation desired in the intensity of the oscillations. It is obvious that fast speed telegraphy is rendered possible on this method, a band or wire prepared in ad vance in accordance with the Morse signs being quickly moved. Finally, if the substance be applied rhythmically in conformity with the speech, a wireless telephony is in this way rendered possible. This may be realized by thecoatmg being varied quantitatively, qualitativcly,

or inboth respects, in conformity with the s )eech, for instance by means of a microp one current, if the coating is applied in clectrolytical Way, or by actuating acoustically a flame or a jet containing the substance.

[t is a well-known fact that, in generators of the kind mentioned; it is advantageous to arrange the arc in a hydrogen-containing atmosphere. This may be combined with the present principle, by applying to both electrode's a substance containing hydrogen, for instance, as mcntioncd above, oil or the like. The latter subs! ance will then be decomposed, totally or partially, in the arc, so that not only thicoating is obtained, but also that the arc is surrounded by a hydrogen containing atmosphere.

The bodies used as electrodes may it desired have water llowin; through them being in this case made hol ow, orthcy may be cooled in any other suitable way.

In Fig. 4 l have illustrated a practical arrangement ol oscillation circuit in which an apparatus constructed as above described may be cmbodicd. 'll designates an aerial and 12 is a closed oscillation circuit including inductance l3 and capacity l4. I5 is a transformer or air coil coupling the aerial with the oscillation circuit 12. 16 and 17 designate connections from a source of electric potential or power, and which is connectcd through the inductanccs 18 with the electrodes c and is of the arc. The. antimony depositing flame or other similar flame or device X may be mounted on a lever 19 which is displaced by a key 20 so that the llame moves into and out of contact with the electrode lc. it is evident that, if the electrode 70 rotates slowly, the film deposited on its surface will vary in accordance with the movements of the key 20. The oscillations of the arc and the transmission of the signals will therefore take place in accordance with the movements of the transmitting key as required.

Ilaving, thus described my invention, l claim as new and desire to secure by Letters Patent.

1. In an apparatus 'for generating-electrical oscillations by means of an electric are or the like, a circuit. including inductance and capacity, an electrode in said circuit, an cloctrode having a thin coating forming the actual electrode substance, and. means tor continuously renewing said coating.

2.ln an apparatus for generalinc electrical oscillations by means of an electric arc or the like, an oscillation circuit, an electrode in such circuit, another elcctrodc having a thin coating constituting the actual clcctrodo substance and means for renewing said coat ing continuously in accordai'icc with the signals or vibrations to be transmitted.

in wilncss whcrcol', l subscribe my signaturc, in the presence of two witnesses.

YALDEMAK lUllllSl li Witnesses:

Vioon Bum,

J AXl-LL licnmru 

